Acumbamail

I started using the service in November 2024. It was working OK. In the last 2 email campagins 1+ months ago, some of my family members and my other Gmail account with Gmail email addresses did not receive campagin email in inbox AND spam folder, even though it was not a problem before. I contacted the support. I got the standard email delivery info with a link to an article. I am creating a new campagin now. I have sent test emails on the camppaign creation page to my 2 Gmail accounts + 2 non-Gmail address AND the email address in the Acumbamail account. None arrive (not in spam folder either), even after 30 minutes. Emails sent to Gmail used to arrive very fast. I think something is wrong with their email delivery. It is getting worse and now it doens't seem to be working at all. I am looking to switch to another service, as I can't relay on this service any more.